After a meteor shower, Earth boy Li Letian and his best friend Zhang Qi discovered three strange creatures near their home. They are alien aliens who wandered to the earth. They had to survive on the earth due to a spacecraft failure. Several teenagers teamed up with aliens. They had to avoid human pursuit, work together to repair the spacecraft, and deal with various misalignments with the earth's environment. As the adventures of the aliens and the teenagers escalate, they are involved in a secret war between alien forces, and gradually face the test of each other's growth, trust and separation. There are tears among laughter, simple and clear yet ups and downs. The three volumes of stories are both independent and interlocking, and finally end with farewell and reunion.
